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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 11,725 $ 2,639
Accounts receivable, net 69,720 58,925
Unbilled receivables 127 4,765
Inventories 19,136 21,415
Prepaid expenses and other current assets 11,378 4,433
Total current assets 112,086 92,177
Property, plant and equipment, net 274,676 230,461
Operating lease right-of-use assets 32,099 28,178
Intangible assets, net 8,253 9,046
Other assets 563 3,541
Total assets 427,677 363,403
Current liabilities:    
Accounts payable 3,268 3,961
Accrued expenses and other liabilities 13,142 8,578
Deferred revenue, current 6,875 7,654
Income taxes payable 0 542
Long-term debt, net, current 6,901 6,175
Operating lease liabilities, current 7,077 13,108
Total current liabilities 37,263 40,018
Deferred revenue, net 3,482 1,670
Long-term debt, net 22,445 28,240
Operating lease liabilities, long-term 27,020 15,469
Deferred tax liabilities, long-term, net 32,981 24,408
Asset retirement obligation 14,996 6,142
Contingent consideration 180 1,900
Other non-current liabilities 503 0
Total liabilities 138,870 117,847
Commitments and contingencies (Note 17)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 43,193,394    issued and 41,575,129 outstanding at December 31, 2020; 40,975,408    issued and 40,234,451 outstanding at December 31, 2019 42 40
Treasury stock, at cost, 1,618,265 and 740,957 shares at    December 31, 2020 and 2019, respectively (4,134) (2,979)
Additional paid-in capital 171,209 165,223
Retained earnings 121,267 83,313
Accumulated other comprehensive income (loss) 423 (41)
Total stockholders’ equity 288,807 245,556
Total liabilities and stockholders’ equity $ 427,677 $ 363,403